Transformer.



S. E. JOHANNBSEN.

TRANSFORMER. urmonmu nLnnun. 26, 1911.

PatentgdDc. 5, 1911.

Fig. 2.

Inn-lulu 1 V 1 V V v I Witnesses:

Inventor n W. m .D h kw E d n e V, S

SVEND E. JOHANNEBEN. OF PI'ITBFIELD, MASSACHUSETTS, ABHIGHOB T0 GENERAL ELECTRIC COMPANY, A OOBPOBA'IION 01" NEW YORK.

TRANSFORMER.

Specificattsm of Letters Patent.

Patented Dec. 5. 1911.

Application fled hna ry 96, 1811. Serial No. 804,706.

7b all whom it may concern:

Be it known that I Svnrw E. Jonasunssn, a citizen of the iJnited States, residing at Pittsfield, county of Berkshire, State of Massachusetts, have invented certain new and useful Improvements in Transformers, of which the following is a specification.

My invention relates to transformers.

It is often desirable to connect a resistance with either the primary or secondary winding.

The primary object of my invention is to so construct .a transformer that a part of the transformer itself, the core, may be used as a resistance. I have embodied this idea in a construction herein later described, my object in this device being to provide a bell-rin 'ng transformer, the transformer to be use especially in connection wit-h the ordinary lighting or power circuit to supp-l a current at a Volta e suitable for use wit door bells or other divices requiring a small amount of energy and wherein the current should be kept within safe limits at all frequencies, even if the secondary be short circuited.

A further object is to so construct this device that it ma be used with a direct current supply, in which case a part acts merely as a resistance to lower'.the voltage to a proper 'value for door bell use.

- form a part of this specification an In the accompanying drawings which d wherem similar reference characters refer to the same parts in all the figures, Figure 1 is a side vlew partly in section, showing a bell ringing transformer in its case; Fig. 2 shows the transformer-removed from its case, and shows the connection of the core inseries with one of the windings Fig. 3 isa diagrammatic view of the connectionofthe core in series with one'of the windings, and also shows a tap from that winding.

According to my invention, the core 1 of the transformer is constructed to present a continuous electric path andon this core the primary and secondary windings are laced in any desired manneri, One end of is core path is then connected with the primary winding 2 or the secondary windmg 8, as desired. Obviouslly, it is not necessary that the entire lengt of iron in the core be used, but the element! of the drawone terminal 9 of the the lig the volta c tothe desired value.

arded as a part only of the whole core of t e transformer.

In the construction shown, I have used insulated iron wire for the core, but this-is not necessar so long as t at part which is to be used as the resistance presents a continuous ath for the electric current, and is insulated from itself and from adjacent conducting bodies. Thus the laminations commonly usedin constructing cores may be used by properly insulating them and connecting them together to form an electrical path.

In the particular construction illustrated, the primary winding 2 has a greater number of turns than the secondary 3 and the two are wound, one on the other, in the coil 4. The terminals 5 of the secondary are shown brought out to suitable binding posts.

ing may be re any form of core may be used The cross section of the coil 4 is made'as nearly circular as possible, and OHfiWlllCh is placed a' fiber spool 6, on which wound a coil of insulated iron wire forming the core 1. One terminal 7 of the iron wire and rimary are-carried out of the case; the ot er terminals of the iron and the primary are connected at 8.

When the device is to be used on analternating current circuit the terminals 7 and 9 are connected to the supply line 11 12 and the bell or other device to be supplied with energy with its switch is connected to the terminals 5, 5. The resistance of the iron core is suificient to keep the current at a safe value even .though the secondary be short circui-ted. It

ht or power circuit Wlth whic the device is to be may be, howevbrhthat used carries direct current. To suit sucha condition a tap 10 is taken from the primary at a point such that theresistance of the primary between the termii nal 9 and the tap 10 is sufiicient to lower 11 and switch are connected in ortion of the lprimary wind,

t is not absocase the. series with this across the inc 1-1, 12.

Inthis into! necessary that the tap 10 be so 10- ca that a art of the prima winding is used as the 0. resistancebu it is access so. more! that the 'ro resistance be iniiliided b twen the gap g nd one of the other Thus I have devised a transformer where- Sn-acted the sired by changing the connections a part of. I

maybe used as a plain rein a part of the transformer itself may be used to replace the resistance which is commonly, entirely separate. Further, that I have ap lied my invention in this instance, to a be -rin 'ng transformer and so conransformer that ifitis domeans. a I

,What I claim as new and desire to secure by Letters Patent of the United States, 1s,: t

1. In a transformer, a'winding and a core connected in circuit with the winding to act as a resistance.

re resent the best embodiment thereof; but j fiesire to have it understood that the apparatus shown is only illustrative and that the invention can be carried out by other 2 In a transformer, a winding and a core of insulated wire connected in circuit. with the win to act as a resistance.

3. In a ell ringing transformer, a primary windlrlxlg, a secondary winding, and a core of ms ated wire'connected in series with the primary winding.

4. In a bell ringing transformer; a primary winding, a secondary winding a core of msulated wire in series with the primary and a tap in one of the windings. r

5. A device of the character described for use with both direct current and alternating current to reduce the power to desire values comprising a transformer provided with a core "of insulated wire, a primary winding in series with the core, a secondary winding and a tap located in one of the win s. p

ln wltness whereof, I'have hereunto set my hand this 19'day of Jan., 1911.

SVEND E. J OHANNESEN. Witnesses:

Roam-r J. Connor,

Oonuss E. Sm. 

